| 双金属核壳结构负载型Au@Ag/TiO2催化剂的制备及表征 |
| Preparation and Characterization of Bimetal Core-Shell Structure Supported Au@Ag/TiO2 Catalyst |
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| 摘要: 利用溶胶法制备了Au核Ag壳(Au@Ag)结构复合纳米粒子，用粉末-溶胶法和水热合成法使其负载于TiO2纳米粒子上，利用紫外-可见吸收光谱﹑X射线粉末衍射﹑透射电子显微镜对复合结构材料进行了结构表征，并对其光催化消除臭氧的性能进行了研究。结果表明，制备方法、Au/Ag化学计量比及金属负载量等对光催化消除臭氧的活性均有很大影响。采用粉末-溶胶法制备的1%-Au@Ag/TiO2(nAu/nAg=1∶3)催化剂，由于TiO2表面沉积的Au@Ag金属颗粒尺寸小且分散度高，而且1%的金属担载量有利于光生电子空穴的有效分离，光催化消除臭氧的活性最高。 |
| 关键词: 核壳结构 复合纳米粒子 负载型催化剂 光催化 臭氧消除 |
| 基金项目: |
| Abstract: Core-shell Au@Ag nanoparticles were prepared by the sol method and deposited on TiO2 nanoparticles by the powder-sol method and the hydrothermal method. The structure of sol and Au@Ag/TiO2 was characterized by UV-Vis, XRD, and TEM techniques. The activity of phtocatalytic elimination of ozone was investigated on Au@Ag/TiO2 surface. The results show that preparation method, Au/Ag stoichiometric proportion and the metal loading have great effect on the activity of photocatalytic elimination of ozone. 1%Au@Ag/TiO2(nAu/nAg=1∶3) photocatalyst prepared by powder-sol method has the best activity for photocatalytic elimination of ozone due to the small particle size of Au@Ag, higher dispersion of metal and the effective separation of the photo-generated electron and hole. |
| Keywords: core-shell structure composite nanoparticles supported catalyst photocatalysis elimination of ozone |
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| 孙彦红,张 敏,杨建军.双金属核壳结构负载型Au@Ag/TiO2催化剂的制备及表征[J].无机化学学报,2009,25(11):1965-1970. |
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